JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7494-7507
·
IF 4.22
Zhang Rui,Yuan Yaoxin,Zhang Jianfeng,Liu Haiyun,Chen Gang,Li Kun,Hong MengQing,Zuo Wenbin,Wang Chunlan,Yang Wen,Qin Zhenxing
Mn-doped perovskite CsPb(Cl/Br) 3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn 2+ emission peak in orange-red region via energy transfer from exciton to Mn 2+ emission. Although doping high concentration Mn 2+ could increase the Mn 2+ emission, excess Mn 2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn 2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl 3 and (Mn, Ni): CsPb(Cl/Br) 3 NCs, which introduces NiCl 2 in the Mn: CsPb(Cl/Br) 3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn 2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni 2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br) 3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
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Materials Today Chemistry
·
2022
·
IF 7.613
J. Ding,X. Cui,Q. Ren,Y. Mao,J. Zhang,G. Zhou,X.-M. Zhang
Organic-inorganic metal halides have garnered extensive attention due to their versatile structures as well as fascinating optical properties , among which especially antimony halides are the focus of recent research. Herein, we design a series of novel zero-dimensional (0D) antimony halides of (C 13 H 14 N 3 ) 3 SbCl 6– x Br x ( x = 0, 3, 6) with bright and tunable broadband emissions from yellow (576 nm) to orange (600 nm), which are attributed to the triplet self-trapped excitons (STEs) of the six-coordinated [SbX 6 ] 3– (X = Cl − or Br − ) units. The role of halogens on their specific 3 P 1 → 1 S 0 transition is determined, wherein Cl/Br transmutation reveals a common law modulating photoluminescence behaviors. Furthermore, a new two-step compound technology is innovatively developed for performance optimization, enabling by incorporating the pristine antimony halides into polymethyl methacrylate (PMMA) with high transparency and strong moisture resistance . The composites (C 13 H 14 N 3 ) 3 SbCl 6– x Br x /PMMA ( x = 0, 3, 6) were fabricated through a demanding technology that significantly improve the processability and water stability of antimony halides while maintaining high photoluminescence quantum yields . This work not only proposes a method for halogen substitutions to tune emission, but also opens up a feasible research avenue for performance optimization in the multifunctional luminescence materials.
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Light-Science & Applications
·
2026
·Vol. 15
·期 1
·135
·
IF 24
Maimaitizi Hujiabudula,Ågren Hans,Chen Guanying
The development of pure-blue perovskite light-emitting diodes (PeLEDs) still lags behind that of green and red-emitting PeLEDs. Mixed halide (Br/Cl) perovskite nanocrystals (PeNCs) are commonly employed for blue emission but suffer from halide vacancies and ion migration. Here, we present a passivation strategy using the multifunctional fluorinated phosphonic acid molecule (1H,1H,2H,2H-heptadecafluorodec-1-yl)phosphonic acid (HFPA), which possesses active functional groups that improve the stability and electroluminescence performance of CsPb(Br/Cl) 3 NCs. The HFPA molecule is shown to interact with uncoordinated Pb 2+ on the PeNC surface through the phosphonate groups, concurrently establishing hydrogen bonds with adjacent halide ions. Moreover, the presence of fluorine atoms promotes ionic bond formation with the halide octahedra, thereby stabilizing the octahedral structure. The fabricated PeNC-LEDs exhibited a spectrally stable pure-blue emission peak at 467 nm, achieving a significantly improved external quantum efficiency (14.8%, 9-fold higher), maximum luminance (1052 cd·m -2 , 10-fold higher), and half-life (342 s, 13-fold higher) compared to the device fabricated with unmodified CsPb(Br/Cl) 3 NCs. Furthermore, the effective passivation of surface vacancies and stabilization of halogen ions by the HFPA molecules successfully suppressed ion migration in the PeNC-LEDs, thereby significantly enhancing the stability of the device.
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PubMed
高影响因子
CARBON
·
2026
·
IF 11.6
Yanan Zheng,Hao Xu,Xinyi Hou,Xuefeng Yan,Xiaohui Jiang,Liangmin Yu
Heteroatom doping, by synergistically regulating defect concentration, dielectric loss factors, and conductive behavior, enables precise tailoring of the electromagnetic response in carbon-based materials. In this study, lunar-like nitrogen (N), chlorine (Cl) co-doped porous carbon microspheres (N, Cl-PCMs) were fabricated via a hydrothermal–pyrolysis method using a self-synthesized N, Cl-containing compound as the dopant. By adjusting the doping level, controllable morphology and tunable electromagnetic responses were achieved. The heteroatoms create heterogeneous interfaces and defects that act as efficient polarization sites, thereby promoting polarization relaxation while optimizing the conductive network for improved conductive loss. Multiple attenuation mechanisms synergistically enable optimized impedance matching and efficient electromagnetic attenuation. The optimal N, Cl-PCMs-2 exhibits remarkable electromagnetic wave absorption (EMWA) performance, with a minimum reflection loss (RL min ) of −56.00 dB at 2.99 mm and an effective absorption bandwidth (EAB) widened to 5.44 GHz at 2.22 mm. Radar cross-section (RCS) simulations further demonstrated a maximum reduction of 27.45 dB m 2 at 0°, confirming its promise for multiband electromagnetic stealth. This work provides new insight into the multiscale structure of biomass-derived carbons for green, high-performance electromagnetic absorption absorbers.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaomin Song,Qi Huang,Bo Jin,Rufang Peng
To improve the encapsulation of GO to CL-20, PEI was utilized as a linker bridge to self-assemble into composite CL-20/PEI/GO in this study. The self-assembly was in-depth characterized, including Zeta potential, SEM, DLS, XPS, Raman spectra, HPLC and power-XRD. The possible self-assembled mechanism was also proposed, which indicates the electrostatic interaction introduced by PEI should be responsible for the self-assembly. The performance of a self-assembled composite was characterized by BAM and DSC analysis. And the results indicate the enhanced interaction promotes GO more efficiently encapsulate CL-20 and improve the safety of the energetic material. Therefore, this work demonstrates a novel and facile method to solve the deprived interaction and corresponding weak desensitization between desensitizer and energetic material.
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JOURNAL OF SOLUTION CHEMISTRY
·
2026
·
IF 1.3
Xu Saiyuan,Guo Yujun,Wu Yibin,Chen Bin,Xu Yingjie
This study aims to develop and characterize a novel mixed system composed of sodium phenoxide (NaOPh) and a deep eutectic solvent (DES) formed from 1-ethyl-3-methylimidazole chloride ([Emim]Cl) and ethylene glycol (EG), in order to address the phase separation issue commonly encountered in aqueous phenoxide solutions during CO₂ absorption—caused by the generation of phenol. The physicochemical properties, CO 2 absorption performance and absorption mechanism of the NaOPh/DES mixed system were investigated. The results indicate that the density, viscosity, and CO 2 absorption capacity of the studied NaOPh/DES mixed systems increase with NaOPh content. The NaOPh1.0/DES system exhibits the best absorption performance of these systems, with a CO 2 absorption capacity of 2.10 mol‧kg −1 at 313.15 K and 0.1 MPa. DFT calculations reveal that the Na + from NaOPh, the O–H group from EG, and the Cl − from [Emim] Cl can form a stable four-membered ring. This weakens the electrostatic interaction between Na + and [PhO] − , promoting the dissociation of the NaOPh and facilitating the chemical reaction between the “free” [PhO]⁻ and CO 2 to form carbonates. This mechanism is confirmed by FT-IR and 13 C NMR spectra. Using [Emim]Cl–EG DES as a solvent to dissolve NaOPh leverages the reactivity of [PhO] − with CO 2 for efficient absorption, while effectively avoiding phase separation. This expands the application of phenoxide-based systems in CO₂ capture.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Hongyang Zhao,Sihan Fan,Yulong Xiang,Junfeng Li,Yue Li,Xuelu Wang,Xinjuan Liu,Likun Pan
Asymmetric Ni-N-Cl sites are built by NH 4 Cl vaporization. • Ni-N-Cl overcomes the kinetic challenges and delivers excellent CO 2 reduction performance. • XAFS, DFT and CW-ODMR reveal the asymmetric coordination mechanism. • Cl coordination creates electron-rich Ni centers with shifted d-band. • Ni-N-Cl achieves 86.2% CO Faradaic efficiency and enables durable Zn-CO 2 batteries for 53 h operation. Electrocatalytic CO 2 reduction reaction to value-added chemicals represents a promising pathway for sustainable carbon utilization. However, the symmetric coordination environment of conventional M-N 4 single atom sites restricts electronic structure regulation and limits their intrinsic activity. Herein, we develop an asymmetric Ni-N-Cl coordination structure synthesized via high-temperature NH 4 Cl vaporization assisted strategy. This Cl-mediated asymmetric coordination induces a distinct charge redistribution, generates an electron enriched Ni center and an upward shift of the d-band center closer to the Fermi level. These intrinsic modulations significantly facilitate CO 2 activation and proton transfer to the *COOH, thereby lowering the reaction energy barrier. Consequently, the Ni-N-Cl catalyst achieves a CO Faradaic efficiency of 99.67% at -0.7 V vs. RHE in H cell and 17 h long term stability at -100 mA cm -2 in flow cell. Furthermore, this catalyst delivers a peak power density of 1.62 mW cm -2 and a durability of 53 h. This study provides a general methodology for the rational design of asymmetric single atom catalysts through orbital engineering for high-efficiency energy storage technologies. Download: Download high-res image (199KB) Download: Download full-size image
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GREEN CHEMISTRY
·
2026
·
IF 10.6
Yang Li,Guoen Zhang,Chuanshun Feng,Feng Lin,Huan Ye,Wenqi Wei,Qicheng Zhang,Wenchao Peng,Xiaobin Fan
Electrocatalytic conversion of polyethylene terephthalate (PET) plastic waste into formate coupled with hydrogen generation represents a sustainable pathway for plastic upcycling. Herein, a nickel sulfide catalyst (Mo,Cl-Ni3S2) is developed for efficient and stable ethylene glycol (PET monomer) oxidation reaction (EGOR) through a Mo and Cl co-doping strategy. The optimized catalyst Mo,Cl-Ni3S2 possesses a high formate Faradaic efficiency of 94.0% at 1.55 V vs. RHE. Moreover, it maintains 83.3% of its initial activity after 95 hours continuous operation at an industrial current density of 300 mA/cm2. Experiment and theoretical simulations demonstrate Mo and Cl co-doping optimizes the electronic structure of Ni3S2 by upshifting the Ni d-band center and facilitates the in situ structure reconstruction during EGOR. Finally, an integrated acidification-precipitation-recrystallization strategy is proposed to separate and recover terephthalic acid (TPA) and potassium formate. This method offers a holistic approach for upcycling PET waste into value-added chemicals and hydrogen.
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Defence Technology
·
2026
·
IF 6.4
Yanpeng Lyu,Fan Liao,Ligang Zhang,Handong Shi,Guoqiang He,Xintong Han,Jiaoyang Liu,Chuanhao Xu,Chongwei An
High energy and low sensitivity are generally mutually exclusive in energetic materials, and precise regulation of the microstructure is an effective strategy to balance these properties. In this study, CL-20/DAAF composite microspheres with various microstructures—including core-shell, hollow, porous, and irregular hollow structures—were fabricated using a tubular continuous-flow device combined with the principles of phase separation and recrystallization. The influence of the binder on the morphology and properties was also investigated. The results demonstrated that, compared with raw CL-20, the composite microspheres exhibited significantly reduced sensitivity and improved mechanical properties. Specifically, the impact energy increased from 1.75 J to 7.50 J, and the friction sensitivity threshold increased from 108 N to 168 N. The average compressive stress and compressive strain of the PBX charges were enhanced by 22.89%–108.19% and 25.75%–50.28%, respectively, with the 2.5% NC + 2.5% F 2602 composite binder delivering the optimal mechanical performance. In ignition experiments, hollow microspheres showed the highest combustion efficiency, while core-shell microspheres released energy more steadily, achieving a maximum combustion duration of 2175 ms. Theoretical calculations indicated that this composite binder system possesses a higher theoretical detonation velocity. The study confirms that adjusting the microstructure can effectively enhance the combustion and mechanical properties of composite microspheres, thereby balancing high energy with low sensitivity. The tubular continuous-flow self-assembly technology, integrated with phase separation and recrystallization principles, provides a feasible pathway for the controllable construction of composite microsphere architectures and offers a reference for the design and fabrication of other energetic composite microspheres.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2022
·Vol. 29
·期 2
·110-119
·
IF 0
Zhang Zongping,Xu Jie,Zhang Dongmei,Ma Huijuan,Li Tao,Xiao Ting,Pei Cunyuan,Ni Shibing
The safe operating voltage and low volume variation of Li 3 VO 4 (LVO) make it an ideal anode material for lithium (Li)-ion batteries. However, the insufficient understanding of the inner storage mechanism hinders the design of LVO-based electrodes. Herein, we investigate, for the first time, the Li-ion storage activity in LVO via Cl doping. Moreover, N-doped C coating was simultaneously achieved in the Cl doping process, resulting in synergistically improved reaction kinetics. As a result, the as-prepared Cl-doped Li 3 VO 4 coated with N-doped C (Cl-LVO@NC) electrodes deliver a discharge capacity of 884.1 mAh/g after 200 cycles at 0.2 A/g, which is the highest among all of the LVO-based electrodes. The Cl-LVO@NC electrodes also exhibit high-capacity retention of 331.1 mAh/g at 8.0 A/g and full capacity recovery after 5 periods of rate testing over 400 cycles. After 5000 cycles at 4.0 A/g, the discharge capacity can be maintained at 423.2 mAh/g, which is superior to most LVO-based electrodes. The Li-ion storage activity in LVO via Cl doping and significant improvement in the high-rate Li-ion storage reported in this work can be used as references for the design of advanced LVO-based electrodes for high-power applications.
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MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Mu Yang,Qilin Dai,Aiwei Tang,Feng Teng,Hong-shang Peng
Current chloride-bromine mixed perovskite quantum dots (PQDs) suffered from low luminescence efficiency and instability due to migration-nature of ionic species and high defect density. To tackle these challenges, herein a novel type of CH 3 NH 3 Pb(Cl/Br) 3 PQDs (Cl/Br-PQDs) were synthesized via a two-step method. Briefly, pristine silane-capped Br-PQDs were prepared, followed by anion exchange using oleylammonium chloride (OAm-Cl) and in-situ formation of silica shell. The optimal feeding ratio of Cl/Br was determined to be 1:1, which yielded colloidal Cl/Br-PQDs possessing a strong 464-nm emission, a high photoluminescence quantum yield of 94.6% and ultrahigh stability. The high quantum yield was attributed to efficient defects passivation by doped Cl − ions and silica-shell-locked OAm + ligands, whilst the high stability was to silica-shell-restricted migration of halogen ions. Such a combinational strategy of anion exchange and in-situ growth of silica shell may provide an effective solution for synthesis of mixed PQDs with high quality.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fang Chengqian,Dai Yimin,Chen Ling,Wang Zhiheng,Lu Qi,Li Yaqi,Cai Ling,Liu Bo,Zhang Yue-Fei,Li Yan,Wan Li
A magnetic Cl − -intercalated Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH nanocomposite has been successfully synthesized by modified one-step salt-assisted coprecipitation process. The Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH nanocomposite was characterized by FTIR, XRD, XPS, SEM, HRTEM, BET and VSM. The results showed that the Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH particles possessed core (Fe 3 O 4 @SiO 2 ) shell (Cl − -LDH) structures and magnetic properties, and Cl − anions were successfully introduced into LDH interlayers. The unique intercalated structure with week interlayer interaction of Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH provide efficient adsorption of methyl orange (MO), Congo red (CR) and methyl blue (MB), leading to its superior performance with much higher uptake capability with the maximum adsorption capacity of MO, CR and MB reaching 733 mg·g −1 , 910 mg·g −1 and 385 mg·g −1 , respectively. The adsorption process could be well described by pseudo-second-order model for MO, CR and MB. The experimental data of MO and CR could be fitted better with Freundlich model, while that of MB were fitted better with Langmuir model. The adsorption process was spontaneous and exothermic for MO and MB, while spontaneous and endothermic for CR. Moreover, the adsorbent exhibits excellent stability and reusability in the regeneration cycle, and a process called ‘‘post-processing step” is proposed to effectively improve the dye removal ability of the adsorbent in reuse. This study puts forward a new thought for the development of high-performance LDH adsorbents with mesoporous and Cl − intercalation structure for the efficient and rapid removal of dyes.
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